---
cve: "CVE-2026-45884"
severity: "LOW"
cvss: 3.1
epss: "16%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-27 14:17:02"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T01:59:29+02:00"
---

# CVE-2026-45884

> 3.1 LOW

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

apparmor: avoid per-cpu hold underflow in aa_get_buffer

When aa_get_buffer() pulls from the per-cpu list it unconditionally
decrements cache->hold. If hold reaches 0 while count is still non-zero,
the unsigned decrement wraps to UINT_MAX. This keeps hold non-zero for a
very long time, so aa_put_buffer() never returns buffers to the global
list, which can starve other CPUs and force repeated kmalloc(aa_g_path_max)
allocations.

Guard the decrement so hold never underflows.

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.75
- Kernel ≥ 6.18.14
- Kernel ≥ 6.19.4

## Referenzen

- <https://git.kernel.org/stable/c/202824a1f89a9786c20a3d646a7c88d223abb1b2>
- <https://git.kernel.org/stable/c/80c334acc6d0bee8605a358a33e69b4aea1ffb92>
- <https://git.kernel.org/stable/c/4bcddd0f6b2e52b4c7b520e4d36a115caf5b7169>
- <https://git.kernel.org/stable/c/640cf2f09575c9dc344b3f7be2498d31e3923ead>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-45884) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_